Cube and Ball 3D Optical Illusion

Is the red ball inside or outside of the cube?

See Another Random Optical Illusion

Explanation

Do you see that the ball could be inside the cube, in front, or even behind the cube? It is all in where you expect the ball to be in this optical illusion.

A two dimensional picture of a three dimensional object does not always give enough information. Regardless, the eye will transform the image into a projected 3 dimensional object.